| In order to study the effects of compound passivators on the cadmium content of soil and kiwifruit, a completely random block design was adopted in the field with kiwifruit Xuxiang as the experimental variety. The effects of 25 kg·hm-2 lime (C), 450 kg·hm-2 organic fertilizer (O), 120 kg·hm-2 biochar (B) and 40 kg·hm-2 calcium-magnesium phosphate fertilizer (P) on cadmium (Cd) content in soil and kiwifruit were investigated. The results showed as follows: Compared with the control, the soil pH increased by 0.21 to 1.83, and the increase in cation exchange capacity was 3.44% to 26.47%. The application of organic fertilizer (O treatment) and biochar (B treatment) increased soil organic matter by 39.18% and 25.79% respectively. After application of passivating agent, the reductions of total Cd and available Cd in the soil by different passivators were 1.00%~3.90% and 24.40%~44.50% respectively. The passivating agents facilitated the conversion of exchangeable Cd (EXC-Cd) to carbonate-bound (CAR-Cd), oxide-bound (OX-Cd) or organic matter-bound Cd (OM-Cd). The distribution trend of Cd content in different parts of kiwifruit was root > branch > leaf > fruit. Different treatments significantly decreased the Cd content in kiwifruit fruit, roots, branches and leaves by 47.83% to 87.44%, and B treatment had the best effect compared with CK treatment. The Cd enrichment coefficients of kiwifruit in all treatments were significantly decreased, and B treatment had the lowest Cd enrichment coefficient. The root decreased by 66.09%, the branches decreased by 73.19%, the leaves decreased by 87.30%, and the fruits decreased by 84.47%. In addition to C treatment, the transport coefficients of Cd in different parts of kiwifruit were decreased. The transport coefficients of Cd in different parts of kiwifruit plants in B treatment decreased most significantly from root to branches by 20.86%, from branches to leaves by 52.46%, and from branches to fruits by 41.45%. In conclusion, the application of these four passivating agents can significantly reduce the soil Cd content and form, enrichment and transport of kiwifruit. The application of 120 kg·hm-2 biochar was the most effective way to reduce risk of soil and kiwifruit Cd contamination, which can provide technical support for the safe production of kiwifruit. |